Patent US4580540A successfully refreshed from Google Patents.
US4580540A
Expired / Lapsed
US
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Fuel injection pump for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1980-10-10
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Granted: 1986-04-08
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Expires: 2000-10-10
Abstract
Abstract An electrically controlled fuel injection pump is proposed, in which a portion of the discharger from the pump work chamber is varible by means of an electrically adjustable throttle.
Inventors
- 👤 Rudolf Babitzka
- 👤 Walter Schlagmuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:38
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/20; F02M59/36; F02M59/366; F02M41/00; F02M41/08; F02M41/10; F02M41/12; F02M41/123; F02M41/125; F02M2200/00; F02M2200/21
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
A fuel injection pump for supplying fuel intermittently to an internal combustion engine comprising a pump work chamber, at least one pumping device to generate a pressure for fuel injection, a relief conduit, at least one electrically actuated control device in said relief conduit to determine the onset and end of fuel injection and to control fuel flow through said relief conduit of the pump work chamber to a suction chamber, further comprising a throttle means disposed in said relief conduit the cross section of which is electrically adjustable, said throttle means arranged to vary the injection quantity supplied per unit of time.
Claim 2
Dependent Claim
103 words
A fuel injection pump for supplying fuel intermittently to an internal combustion engine comprising a pump work chamber, at least one pumping device to generate a pressure for fuel injection, a relief conduit, at least one electrically actuated control device in said relief conduit to determine the onset and end of fuel injection and to control fuel flow through said relief conduit of the pump work chamber to a suction chamber, further comprising a throttle means disposed in said relief conduit the cross section of which is electrically adjustable, said throttle means arranged to vary the injection quantity supplied per unit of time.
Claim 3
Dependent Claim
23 words
A fuel injection pump as defined by claim 1, characterized in that said control device and said throttle means are switched in parallel.
Claim 4
Dependent Claim
23 words
A fuel injection pump as defined by claim 1, characterized in that said control device and said throttle means are switched in series.
Claim 5
Dependent Claim
30 words
A fuel injection pump as defined by claim 1, characterized in that said control device and said throttle means are combined into a single control member as a piezo-controlled element.
Claim 6
Dependent Claim
40 words
A fuel injection pump as defined by claim 1, characterized in that said pumping device further includes a distributor pump having a simultaneously reciprocating and rotating pump piston arranged to feed fuel sequentially into pressure lines leading to said engine.
Claim 7
Dependent Claim
28 words
A fuel injection pump as defined by claim 5, characterized in that a portion of said fuel in said pump work chamber is introduced into said relief conduit.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |